Highly efficient and high colour rendering index white organic light-emitting devices using bis(2-(2-fluorphenyl)- 1,3-benzothiozolato-N,C 2′) iridium (acetylacetonate) as yellow emitter
Document Type
Article
Publication Date
7-1-2007
Abstract
Multiple emissive layer (MEML) white organic light-emitting devices (OLEDs) are fabricated. In the MEML, the yellow phosphorescent emitter bis(2-(2-fluorphenyl)-1,3-benzothiozolato-N,C2′) iridium(acetylacetonate) [(F-BT)2Ir(acac)] is introduced to codope with the red one bis(2,4-diphenyl-quinoline) iridium acetylacetonate [Ir(piq)2acac] into 4,4′-N,N′-dicarbazole-biphenyl (CBP), fac tris(2-phenylpyridine) iridium [Ir(ppy)3]-doped CBP is used for green emitting and N,N′-di(naphthalene-1-yl)-N,N′-diphenyl-benzidine (NPB) is used for both hole transporting and blue emitting. By adjusting the devices' structure, we get the OLED which has the maximum luminance of 50 030 cd m-2, maximum efficiencies of 21.6 cd A-1 (at 7 V), 10.3 lm W-1 (at 5 V) and 8.4% (at 7 V) and colour rendering index (CRI) of 85. In addition, its Commission International de L'Eclairage (CIE) coordinates slightly change from (0.3867, 0.4075) to (0.3638, 0.4070) when the drive voltage shifts from 7 V (1862 cd m-2) to 13 V (39 270 cd m-2). © 2007 IOP Publishing Ltd.
Publication Source (Journal or Book title)
Semiconductor Science and Technology
First Page
798
Last Page
801
Recommended Citation
Li, J., Chen, P., Duan, Y., Zhao, F., Li, C., Xie, W., Liu, S., Zhang, L., & Li, B. (2007). Highly efficient and high colour rendering index white organic light-emitting devices using bis(2-(2-fluorphenyl)- 1,3-benzothiozolato-N,C 2′) iridium (acetylacetonate) as yellow emitter. Semiconductor Science and Technology, 22 (7), 798-801. https://doi.org/10.1088/0268-1242/22/7/021